* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

li {
    list-style: none;
}

.box{
    position: relative;
    width: 721px;
    height: 455px;
    background-color: purple;
    overflow: hidden;
    margin: 100px auto;
}
ul {
    position: absolute;
    left: 0;
    top: 0;
    width: 600%;
}

img {
    width: 721px;
    height: 455px;
}
.box ul li {
    float: left;
}

.arrow-l,
.arrow-r {
    display: none;
    position: absolute;
    top: 50%;
    margin-top: -20px;
    width: 24px;
    height: 40px;
    background: rgba(0, 0, 0, .3);
    text-align: center;
    line-height: 40px;
    color: #fff;
    font-family: 'icomoon';
    font-size: 18px;
    z-index: 2;
}
.arrow-r{
    right: 0;
}
.circle {
    position: absolute;
    bottom: 10px;
    left: 50px;
}
.box .circle li {
    float: left;
    width: 16px;
    height: 16px;
    /*background-color: #fff;*/
    border: 2px solid rgba(255, 255, 255, 0.6);
    margin: 0 3px;
    border-radius: 50%;
    /*鼠标经过显示小手*/
    cursor: pointer;
}

.current {
    background-color: #fff;
}